Quote:
Originally Posted by pepak
Jellby: Well, a "reader feature" is the same thing as "proprietary extension" - EPUB does specify how a book should be rendered, and any different rendition is proprietary. It doesn't matter where the additional rendition comes from (it could just as well come from the filename, for example, and wouldn't be any less proprietary because of that, even though the book file itself would remain unchanged).
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If the data comes from standardised information in the book like the author and title then i do not see how it can be a proprietary extension of the format. That is like saying that a device the read the book out aloud is a proprietary extension even if it only use the standardised information in the ePub file.